Update to 2.9.1

Upstream changes:
Moodle-2.9.1

Highlights

A lot of work has been done in dealing with unexpected grade changes in the gradebook which some users have experienced when upgrading from Moodle 2.7 to 2.8 or 2.9. See the user documentation Grades min max and Gradebook calculation changes for details.

    MDL-48618 - Dealing with unexpected changes to grades after upgrading to Moodle 2.8
    MDL-49257 - Adjusting weights when extra credit item is present causes unexpected behaviour
    MDL-48239 - Changing the maximum grade of items with calculation to the value different from 100

Another release highlight is the introduction of the authorised access to the YouTube repository. After upgrading you will need to enter an API key from YouTube into your site's YouTube repository settings.

    MDL-50176 - Authenticated access to the YouTube repository

Functional changes

    MDL-50089 - Gradebook export now respects aggregate only non-empty grades for percentage and letter
    MDL-48467 - Atto: Clean the html even if submitting the form when Atto is in html view mode

API changes

    MDL-49022 - sync_users must trigger event core\event\user_updated

Security issues

A number of security related issues were resolved. Details of these issues will be released after a period of approximately one week to allow system administrators to safely update to the latest version.
Fixes and improvements

    MDL-50177 - Upgrading assignments in 2.7/2.8 works even when conditional access is used
    MDL-39353 - Connection to a hub from behind a proxy server
    MDL-49742 - Enrolled users page no longer displays sorting by fields that are not used in user identity
    MDL-47787 - After deleting a quiz, its question categories and questions remain in the database
    MDL-49764 - Fixed gradebook UI inconsistencies in Internet Explorer
    MDL-49885 - The course overview block can now be added to Dashboard
    MDL-50675 - Display Wikimedia repository thumbnails (caused by the change in Wikimedia API)
    MDL-50091 - Fixed fatal error in gradebook singleview after a module has been uninstalled
    MDL-48664 - Messaging contacts paging bar no longer expands and overlaps other text
    MDL-50092 - User unenrollment is now working with IMS Enterprise
    MDL-49560 - SOAP web service now works with token
    MDL-50004 - Fix coursename and enrolment icons in category combo on Frontpage
    MDL-50646 - Site default language should be set as the language for new users
    MDL-50394 - Grade to pass no longer throws an error when a decimal point separator is used
    MDL-50276 - Added missing new line separator in plain text e-mails from the forum
    MDL-49061 - The activity completion report in a course correctly shortens headers when multi language filter is used
    MDL-50275 - Added missing version bump after risk bitmap change in MDL-49941
    MDL-50380 - Fixed missing parameter error when editing files in wiki

(wen)